Authentication failed while invoking Web Service

Hi All,

I'm trying to use a web service via a UDF (SOAP Lookup). I've taken a FILE sender channel & in the mapping I'm using SOAP lookup & the response is to be taken in another FILE. Now when I try to do this I get the below message in the File.

<?xml version="1.0" encoding="UTF-8"?>

<yq1:com.sap.engine.interfaces.webservices.runtime.ProtocolExceptionExt xmlns:yq1="http://sap-j2ee-engine/client-runtime-error">Authentication failed. For details see log entry logID=C000C68D461A2DA30000000100190172 in security log.</yq1:com.sap.engine.interfaces.webservices.runtime.ProtocolExceptionExt>